Originally Posted by
Greg
Update: Bought an 8x10 pinhole camera that had a focal length of 125mm. Camera, as described by the maker, came with a pinhole of 0.0120". Thickness of the brass stock unknown. Initial test exposures looked terrible to me.
Looked at the Pinhole Designer program , but unfortunately need a PC to run it and all I use are Macs.
Thanks to rbiemer's #5 post, proceeded as follows: I got some .002" brass shim stock and drilled (#78 drill size) a 0.0160" hole in it. Placed a ball peened hammer face up, placed the drilled pinhole dead center on it, and struck the pinhole with another ball peened hammer. Pinhole became smaller so drilled it out again. Did this a couple of times till the edges of the pinhole were extremely thin. Blackened the brass with a sharpie and gently rounded the pinhole out with a needle several times. Made up an exposure table and attached it to the pinhole camera. Attached image (actual contact print looks lot better/sharper than the scan) is one of the first images I took with my "modified" camera.... I was very lucky, this is just the image quality I was looking for. Thanks rbiemer for your post.
Greg
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